table{
    width: 600px;
    border:1px solid rgba(0,0,0,.5);
    border-radius:5px;
    box-shadow: 5px 5px 15px #000;
    border-collapse:collapse;/*合并相邻边*/
    overflow:hidden;

}
th,
td{
    pading:5px;
    border:1px solid rgba(0,0,0,5);
}